Daimler Chrysler Ag

Dornier Gmbh

Ralf Moos

Carsten Plog

Aleksandar Knezevic

Thomas Birkhofer

Ralf Mueller

Werner Maunz

Michael-Rainer Busch

Thomas Stengel

Wolfgang Schaefer

Roland Kemmler

Klaus Binder

Dirk Voigtlaender

Tillmann Braun

Renato Andorf

Dirk Voigtl&auml;nder

Norbert Markert

Marco Fandel

Burkhard Kessler

Armin Kayser

Holger Leye

Plog Carsten

Udo Flesch

Ulrich Simon

Michael Bischof

Wolfgang Menesklou

Hans-J&uuml;rgen Schreiner

Karl Heinz H&auml;rdtl

Matthias Bohl

Thomas Ried

Willi Muller

Willi Mueller

Klaus-J&uuml;rgen Marquardt

Armin H&uuml;rland

The operating temperature of a gas sensor capable of sensing a gas or a gas composition at a high temperature, for example 1000&#xb0; C. is maintained constant over the entire volume of a gas sensor layer or function layer () secured to a sensor carrier section of the gas sensor by supplying heat to the gas sensor layer () in such a way that varying heat dissipations in the sensor carrier section are compensated. For this purpose, an electrical heater for heating the gas sensor layer () has individual heater sections with different heating resistance values which depend on a spacing between any individual heater section and the tip of the sensor carrier section.

Arrangement of a heating layer for a high-temperature gas sensor

A method for determining the storage state of an ammonia-storing SCR catalyst, the change in at least one physical property of the SCR catalyst material, changing with the NH storing process, being sensed, the measurement taking place on the SCR catalyst material itself by applying a measuring pickup to the SCR catalyst or bringing it into direct contact with the latter and determining the storage state on the basis of these results. In an alternative embodiment, a material identical or similar to the SCR catalyst material with regard to its physical properties is arranged in the exhaust-gas stream in addition to the SCR catalyst material, and the change in at least one physical property of this substitute material changing with the NH storing process, is sensed, the measurement taking place on the substitute material itself by applying the substitute material to the measuring pickup or bringing it into direct contact with the latter and determining the storage state of the SCR catalyst on the basis of these results.

Method and apparatus for determining the storage state of an ammonia-storing SCR catalyst

A sensor for determining the concentration of sulphur compounds in a liquid includes: a working electrode in contact with the liquid to be analyzed; a referenced electrode insulated from the liquid to be analyzed; a liquid-impermeable membrane located between the working electrode and the reference electrode and permeable to an ion that may form a chemical compound with the sulphur compounds in the liquid to be analyzed; and a reference material in contact with the reference electrode or forms the reference electrode.

Sensor for determining the concentration of sulphur compounds in a liquid

High temperature sensor

In a method for identifying the state of an NOx storage catalyst which is cyclically loaded with NOx in the exhaust stream of an internal combustion engine and regenerated, two electrical defining quantities, independent of each other, of the electrically complex impedance of the NOx storage catalyst are detected, one of the two electrical quantities being a measure of the degree of loading of the NOx storage catalyst, and from the second electrical quantity the point in time being identifiable for the end of the regeneration process of the NOx storage catalyst.

Method for identifying the state of an NOx storage catalyst

An apparatus for reducing the emission of vaporized hydrocarbons in a fuel supply system. The apparatus comprises a filter for binding the hydrocarbons. A catalyst for oxidation of the hydrocarbons to carbon dioxide and water is provided downstream of the filter.

Apparatus for reducing the emission of vaporized hydrocarbons in a fuel supply system

A measuring transformer for detecting hydrocarbons in gaseous media with two resistive oxygen sensors whose electrical resistance is essentially independent of temperature with one of the two resistive oxygen sensors being catalytically activated for reducing hydrocarbons.

Measuring transformer for detecting hydrocarbons in gases

A gas sensor, comprises a substrate, a sensor unit including a functional layer and an electrode structure, and an electric heating and/or temperature measuring arrangement. An electrically conductive shielding structure is provided between the sensor unit and the electric heating arrangement in order to shield the measurement process at the sensor unit from interferences owing to the heating process, thereby reducing or preventing the effects of electrical fields caused by voltages applied to the heating arrangement from altering or disrupting the measurement process.

Gas sensor

In a method for detecting oxygen concentration in a gas, a functional material in the form of a layer or film made of a semiconducting metal oxide, whose thermoelectric power can be represented as a function of partial oxygen pressure, is subjected to the gas to be analyzed. A temperature difference is created between two points on the functional material, and the voltage difference between the two points of the functional material that are at different temperatures is determined as a measure of oxygen concentration.

Method and apparatus for detecting the oxygen content of a gas

Oxygen sensitive resistance materials for use with oxygen sensors, in particular &lgr; probes are described. These materials are based on the fact that with complex metal oxides it is possible&mdash;by adding suitable doping substances&mdash;to achieve a negligible temperature dependence of the electric resistance of these materials for different oxygen partial pressures and to preset it to a desired partial pressure value.

Oxygen sensitive resistance material

A method for determining the fullness or the quality of a catalytic converter that stores gases in a storage medium includes the steps of measuring a change in at least one physical property of the storage medium that changes with the storage process, and determining the fullness or the quality of the catalytic converter.

Method for determining the fullness or quality of a catalytic converter that stores gases

A process and apparatus for selective detection of NO in fluid media, particularly exhaust gases of internal-combustion engines. This process comprises the steps of positioning a nitrosonium-conducting solid electrolyte between two porous electrodes, acting upon one of the two electrodes with the NO-containing fluid medium, and measuring a voltage difference between the two electrodes as an indication of the NO-concentration in the NO-containing fluid medium.

Process for no-detection in fluid media

A Positive Temperature Coefficient of Resistance resistor includes a ceramic material of the composition [(Ba.sub.1-e-x Sr.sub.x R.sub.e).sub.1-a M.sub.a ][(Ti.sub.1-b-d N.sub.b Q.sub.d)].sub.c O.sub.3, wherein M is a trivalent or quadrivalent element or a mixture of two or several of these elements; N is a quinquevalent or hexavalent element or a mixture of two or several of these elements; Q is a quadrivalent element or a mixture of two or several of these elements; R is a bivalent element or a mixture of two or several of these elements; and 0.5.ltoreq.x.ltoreq.1, a is 0 or 0.0003.ltoreq.a.ltoreq.0.3, and b is 0 or 0.0003.ltoreq.b.ltoreq.0.3, 0.8.ltoreq.c.ltoreq.1.2, 0.ltoreq.d.ltoreq.0.2, and 0.ltoreq.e.ltoreq.0.2.

PTCR-resistor

Growing community of inventors

Friedrichshafen, Germany

Ralf Moos